Everyone has their own rates and it depends on how good are they. In my own experience, it is better to pay more and have the job completed than paying less, but have it done more times. I had to get rid of a lot of mold in my old village house. It was in a bad shape and at one point I even wanted to demolish it at one point. I decided to give the mold remediation company a chance and it saved me a lot of money. They got rid of it quickly.